First commit

README.md

+# Agar.io Simulator
+Ce repository contient l'énoncé et la librairie du travail pratique de concurrence : Agar.io Simulator.
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+
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+- "Forker" ce repository dans votre namespace, le passer en **privé** et ajouter votre binôme (un seul repository par groupe).
+- Ajouter ce repository comme deuxième remote (différent de `origin`, nommé `base` par exemple).
+- Ajouter Orestis Malaspinas (@orestis.malaspin), Vincent Pilloux (@vincent.pilloux) et Steven Liatti (@steven.liatti) en tant que *Reporter* de votre repository.
+- Lire attentivement l'énoncé.

lib/gfx.c

+/// @file gfx.c
+/// @author Florent Gluck
+/// @date November 6, 2016
+/// Helper routines to render pixels in fullscreen graphic mode.
+/// Uses the SDL2 library.
+
+#include "gfx.h"
+
+/// Create a fullscreen graphic window.
+/// @param title Title of the window.
+/// @param width Width of the window in pixels.
+/// @param height Height of the window in pixels.
+/// @return a pointer to the graphic context or NULL if it failed.
+struct gfx_context_t* gfx_create(char *title, uint width, uint height) {
+    if (SDL_Init(SDL_INIT_VIDEO) != 0) goto error;
+    // You can replace SDL_WINDOW_FULLSCREEN_DESKTOP by SDL_WINDOW_OPENGL if you 
+    // don't want a full screen render.
+    SDL_Window *window = SDL_CreateWindow(title, SDL_WINDOWPOS_UNDEFINED,
+            SDL_WINDOWPOS_UNDEFINED, width, height, SDL_WINDOW_FULLSCREEN_DESKTOP);
+    SDL_Renderer *renderer = SDL_CreateRenderer(window, -1, 0);
+    SDL_Texture *texture = SDL_CreateTexture(renderer, SDL_PIXELFORMAT_ARGB8888,
+            SDL_TEXTUREACCESS_STREAMING, width, height);
+    uint32_t *pixels = malloc(width*height*sizeof(uint32_t));
+    struct gfx_context_t *ctxt = malloc(sizeof(struct gfx_context_t));
+
+    if (!window || !renderer || !texture || !pixels || !ctxt) goto error;
+
+    ctxt->renderer = renderer;
+    ctxt->texture = texture;
+    ctxt->window = window;
+    ctxt->width = width;
+    ctxt->height = height;
+    ctxt->pixels = pixels;
+
+    SDL_ShowCursor(SDL_DISABLE);
+    gfx_clear(ctxt, COLOR_BLACK);
+    return ctxt;
+
+error:
+    return NULL;
+}
+
+/// Draw a pixel in the specified graphic context.
+/// @param ctxt Graphic context where the pixel is to be drawn.
+/// @param x X coordinate of the pixel.
+/// @param y Y coordinate of the pixel.
+/// @param color Color of the pixel.
+void gfx_putpixel(struct gfx_context_t *ctxt, int x, int y, uint32_t color) {
+    if (x < ctxt->width && y < ctxt->height && x >= 0 && y >= 0)
+        ctxt->pixels[ctxt->width*y+x] = color;
+}
+
+/// Clear the specified graphic context.
+/// @param ctxt Graphic context to clear.
+/// @param color Color to use.
+void gfx_clear(struct gfx_context_t *ctxt, uint32_t color) {
+    int n = ctxt->width*ctxt->height;
+    while (n)
+        ctxt->pixels[--n] = color;
+}
+
+/// Display the graphic context.
+/// @param ctxt Graphic context to clear.
+void gfx_present(struct gfx_context_t *ctxt) {
+    SDL_UpdateTexture(ctxt->texture, NULL, ctxt->pixels, ctxt->width*sizeof(uint32_t));
+    SDL_RenderCopy(ctxt->renderer, ctxt->texture, NULL, NULL);
+    SDL_RenderPresent(ctxt->renderer);
+}
+
+/// Destroy a graphic window.
+/// @param ctxt Graphic context of the window to close.
+void gfx_destroy(struct gfx_context_t *ctxt) {
+    SDL_ShowCursor(SDL_ENABLE);
+    SDL_DestroyTexture(ctxt->texture);
+    SDL_DestroyRenderer(ctxt->renderer);
+    SDL_DestroyWindow(ctxt->window);
+    free(ctxt->pixels);
+    ctxt->texture = NULL;
+    ctxt->renderer = NULL;
+    ctxt->window = NULL;
+    ctxt->pixels = NULL;
+    SDL_Quit();
+    free(ctxt);
+}
+
+/// If a key was pressed, returns its key code (non blocking call).
+/// List of key codes: https://wiki.libsdl.org/SDL_Keycode
+/// @return the key that was pressed or 0 if none was pressed.
+SDL_Keycode gfx_keypressed() {
+    SDL_Event event;
+    while (SDL_PollEvent(&event)) {
+        if (event.type == SDL_KEYDOWN)
+            return event.key.keysym.sym;
+    }
+    return 0;
+}
+
+/// Draw filled circle in the specified context, center x, center y, radius and color.
+/// @param ctxt Graphic context where the circle is to be drawn.
+/// @param xc Center x coordinate of the circle.
+/// @param yc Center y coordinate of the circle.
+/// @param r Radius of the circle.
+/// @param color Color of the circle.
+void gfx_drawcircle(struct gfx_context_t *ctxt, int xc, int yc, int r, uint32_t color) {
+    // TODO
+}

lib/gfx.h

+#ifndef _GFX_H_
+#define _GFX_H_
+
+#include <stdint.h>
+#include <stdbool.h>
+#include <SDL2/SDL.h>
+
+#define MAKE_COLOR(r,g,b) ((uint32_t)b|((uint32_t)g<<8)|((uint32_t)r<<16))
+
+#define COLOR_GET_B(color) (color & 0xff)
+#define COLOR_GET_G(color) ((color >> 8) & 0xff)
+#define COLOR_GET_R(color) ((color >> 16) & 0xff)
+
+#define COLOR_BLACK  0x00000000
+#define COLOR_RED    0x00FF0000
+#define COLOR_GREEN  0x0000FF00
+#define COLOR_BLUE   0x000000FF
+#define COLOR_WHITE  0x00FFFFFF
+#define COLOR_YELLOW 0x00FFFF00
+
+typedef unsigned int  uint;
+typedef unsigned long ulong;
+typedef unsigned char uchar;
+
+struct gfx_context_t {
+    SDL_Window *window;
+    SDL_Renderer *renderer;
+    SDL_Texture *texture;
+    uint32_t *pixels;
+    int width;
+    int height;
+};
+
+extern void gfx_putpixel(struct gfx_context_t *ctxt, int x, int y, uint32_t color);
+extern void gfx_clear(struct gfx_context_t *ctxt, uint32_t color);
+extern struct gfx_context_t* gfx_create(char *text, uint width, uint height);
+extern void gfx_destroy(struct gfx_context_t *ctxt);
+extern void gfx_present(struct gfx_context_t *ctxt);
+extern SDL_Keycode gfx_keypressed();
+extern void gfx_drawcircle(struct gfx_context_t *ctxt, int xc, int yc, int r, uint32_t color);
+
+#endif